Screw-cutter



J. PE'AVEY SGREWCUTTER.

(No Model.)

Patented Mar} 18, 1884 ognphen Wzslrnglon. n. c.

UNTTED STATes PATENT Grinch.

ANDRE J. PEAVEY, OF SOMERVILLE, ASSIGNOR TO HIHSELF AND EDWIN B.BUGKINGHAM, OF BROOKLINE, MASSACHUSETTS.

SCREW-CUTTER.

SPECIFICATIIQN forming part of Letters Patent No. 295,422, dated March18, 1884,

Application filed May 1, 1583.

To a-ZZ whom it may concern:

Be it known that I, ANDREW J. PEAVEY, of Somerv'ille, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Screw-Cutters, of which the following is a full,clear, and exact description.

This improved screw-cutter in substance is composed, of a stock of screwcutting dieblocks, either within or without a steadying diebiockseparate and distinct therefrom, and earns or scrolls in said stock forforcing the dies inward and toward, and again for forcing them outwardand from, the center of the die-block, and of other features, allsubstantially as hereinafter described.

in the accompanying plate of drawings, the present improved screw-cutteris illustrated as a hand-tool.

Figure 1 is a face View; Fig. 2, an edge view; Fig. 3, a section on line3 3, Fig. 2; Figs. 4. and 5, sections on lines 4; e and 5 5, Fig. 1.

In the drawings, A. represents a cylindrical shell or hollow tubularstock' open at both ends. This stock A, from end to end, has fourseparate interior peripheral scrolls or cam or eccentric surfaces 0, allof equal length and eccentricity relative to the axis of the shell, andarranged in regular order, giving a series of shoulders orabut1nents,a,between the innermost end, I), of one scroll G and the outermost and next adjoining end of another and the next scroll in theorder of arrangement.

D is a partition dividing stock A. into two equal chambers, E and F.This partition 1) has four scroll or eccentric or cam slot-s, G, ofequal length and width, corresponding to the scrolls G of the stock, andwhich scrolls G make the outer walls or edges of the slots in each instance. The slots are separated from each other by the parts (I of thecentral partitionplate, D. Each of the chambers E F contains a similarcylindrical die head or block, H, both of equal diameter. Each die-blockhas a central opening, J, through its thickness, a series of four radialdies or cutters, K K and an exterior circumferential groove, L. Thecentral openings, J, are of the same diameter, and in line with themboth is an opening, M, through the shell-partition. The radial dies or(No model.)

cutters K K of each die-head H are arranged in radial guideways fthereot'at equal distances apart, and they are constructed, as also saidgnideways, for the dies or cutters to be moved in toward and out fromthe center of the dieblock, and for each to be projected at its innerand working face or edge, g, into the central opening of thedie-block,and at its outer edge, h, beyond the outer periphery of the diehead, bysimply sliding them in the proper direc- 6o tions therefor in theirguideways. Each diehead in its chamber (of the common stock) is centeredby its bearing against the innermost ends of the scrolls 0 around saidchamber. and it is free to be turned around within said scrolls 0 whenits dies or cutters are not projected beyond its periphery sufficientlyto abut againsttheshoulders a of the scrolls; and,

again, it is held against escape from its chamber by means of a screw,L, which is screwed through the sides of the stock or shell A andentered into its peripheral groove 1. Each die or cutter K K has a lug,m, of suitable length to enter a cam-slot, G, of the partition I),dividing the stock into two chambers and 7 5 separating the twodie-heads; and the lugs of each set of dies or cutters K K are also ofsuch a length that the two lugs-one of each of the two sets of dies orcutters in the one and the same cam-slot G will not interfere with eachother. The dies K of the one diehead, attheir inner edges, g, are eachsuitably formed to act as cutters to cut a thread upon the bolt, &c.,over which thescrew-cuttingtool herein described is placed, and the diesK of 8 5 the other die-head, H, have their inner edges smooth, so assimply to bear upon the surface of said bolt, 820., so inserted withoutcutting .into the same, and thus steady the tool in its operation ofcutting a screw-thread upon the bolt, &c., by the action of the screWcutting dies of the head as the tool is swung around the bolt, &*-c., inthe usual way of threading a bolt with screw-cutting tools.

The scrolls C of the chambers in which the die-heads are placed act, inthe use of the tool, to force the screw-cutting dies K, as also thesteadying-dies K into close contact with the bolt, and to feed thescrew-cutting dies forward so as to cut a screw-thread of the depth desired, which in any event cannot be a depth greater than the extremelength of throw inward of the screw-cutting dies by the eccentricity ofthe scrolls relative to the central axial line of the die-heads.

The tool to bring the cutting-dies into operation to out a screw-threadupon a bolt, &c., is swung around upon the bolt, &c., from right toleft, and to place the cutting-die out of such operation, from left toright. In the first movementthe cutting-dies are forced inward towardand against the bolt, &c., to the limit of the cocentricity of thestock-scrolls O by running at their outer ends against said scrolls O,and in the latter movement the cutting-dies are drawn outward from thebolt, &c., by the action of the inner walls of the cam slots G in thepartition-plate upon the lugs ofthe dies.

Each die-head K K is adapted to be fastened to the common stock orshell, or both, by a separate mill-headed screw, M, each of which screwspasses loosely through a separate peripheral slot, 12, of the stock,and, screwing into the side of the die-head, is brought to a seat .by

its shoulder 1 against the outside of the shell. By these means thecutting-dies can be adjusted and fixed in position as to their actionupon the bolt, &c., to be screw-cut-that is, as to the depth ofscrew-thread which the tool can cut, of course within the limits of thethrow of the scrolls upon the steadying or cutting dies.

Having thus described my invention. what I claim, and desire to secureby Letters Patent, 1s-

1. A screw-cutter composed of a stock having scrolls O, and two chambersseparated by a partition, D, and of two die blocks, H, one in each ofsaid chambers, and each block provided with radial dies K K that arearranged within said blocks, as also said dieblocks within saidchambers, for the dies to be acted upon by said scrolls, substantiallyas described, for the purpose specified.

2. A screw-cutter composed of a stock, A, having scrolls O, and twochambers, E F, separated by a partition, D, having scroll-slots G, andof two die-blocks, H, one in each of said chambers, and each blockprovided with radial dies that are arranged within said blocks, as alsosaid die-blocks within said chambers, for the dies to be acted upon bysaid scrolls and said slots, substantially as and for the purposesdescribed.

3. A die-block having .peripheral groove and radial dies, in combinationwith a pin which enters said groove and holds saiddieblock againstescape from, and at the same time leaves it free to turn within, a shellor stock, A, having scrolls O, to act upon said radial dies,substantially as described, for the purpose specified.

4. A die-block confined within a shell or stock, A, having scrolls 0,against escape therefrom, and free to turn therein, and provided withradial sliding dies, in combination with a slot, at, and set-screw M, bywhich said die-block can be secured against turning, substantially asdescribed, for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

A. J. PEAVEY.

Witnesses:

EDWIN W. BROWN, WM. S. BELLOWS.

